Relisys TE770 monitor

Only 3 years old, LED blinking and relay clicking on and off.
The "on/off" switch short circuits the mains SMPS side of the opto isolator
to switch "off" the monitor, bit unusual.
Disabled the line output drive and running from 50 percent mains
and same clicking/ticking.
Stable 7V or so on the driver side of the opto-isolator
and a 7805 gives a stable 5V for the micro area.
PS Ds and Cs seem ok
Any ideas where to look other than tracing back from the relay, LED area and
back to the
PS rails.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/








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